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Round-trip
Economy
St. Louis, MO
San Juan, Puerto Rico
Sat 4/25
Return
Any month
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Save money on airfare by searching for cheap flight tickets on KAYAK. KAYAK searches for flight deals on hundreds of airline tickets sites to help you find the cheapest flights. Whether you are looking for a last minute flight or a cheap plane ticket for a later date, you can find the best deals faster at KAYAK.

Frequently asked questions
How does KAYAK find such low flight prices?
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What is KAYAK's "flexible dates" feature and why should I care?
How does KAYAK find such low flight prices?
How do I find the best flight deals on KAYAK?
How can Hacker Fares save me money?
Does KAYAK query more flight providers than competitors?
How does KAYAK's flight Price Forecast tool help me choose the right time to buy?
What is KAYAK's "flexible dates" feature and why should I care?

Search cheap flights with KAYAK. Search for the cheapest airline tickets for all the top airlines around the world and the top international flight routes. KAYAK searches hundreds of travel sites to help you find cheap airfare and book a flight that suits you best. Since KAYAK searches many plane tickets sites at once, you can find cheap tickets from cheap airlines quickly.

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